A 25-year-old woman presents to A&E with a severe gradual-onset headache. It is right sided, throbbing and periorbital, and there is associated nausea. She has had similar episodic headaches over the last 5 years and they generally last 10 h before settling.

What is the likely differential diagnosis? *This case is from Docplexus editorial team for educative purpose only Source: Core Clinical Cases in Medical and Surgical Specialties Stay connected, the answer will be posted in next 48 hrs!